code: def test_get_target_version_invalid_format_throws_exception(self):
      with self.assertRaises(RuntimeError):
          get_target_version("div_0")
      with self.assertRaises(RuntimeError):
          get_target_version("div_0_")
      with self.assertRaises(RuntimeError):
          get_target_version("div")
  
file_path: pytorch/test/export/test_upgrade.py
imports: import unittest
  from unittest.mock import patch
  import torch
  import torch._dynamo
  from torch.export import export
  from torch._export.serde.serialize import GraphModuleOpUpgrader
  from torch._export.serde.upgrade import get_target_version, get_upgraders
  from torch.testing._internal.common_utils import run_tests, TestCase
label_desc: Use image node_id 4 for calling the TestUpgrade obj's underlying member method code with example usage: obj.test_get_target_version_invalid_format_throws_exception() without return types